Tamper



TAMPER Filed June 15. 1927 Hh I@ l@ 77 291711] l @lm lllv(9 o j Il 'w 55S "lil Y gmmdoc Patented Mar. 5, 1929.

UNITED STATES JOHN F. MACDOUGALD, F ATLANTA, GEORGIA.

TAMPER.

`Application filed June 15,

This invention relates to tamping devices and more particularly to a pan-like tamper having lugs projecting from the bot tom portion of the tamper to torce the stone or other aggregate in concrete below the surtace. This results in a smooth surface on the concrete. These lugs may be either solid or tubular and it the latter embodiment employed will result in a. device which allows both air and water to How to the surface ot the concrete which is being laid.

In the drawings wherein I have shown the preferred embodiment of my invention,

Figure 1 is a plan view of the tamper,

Figure 2 is a vertical section taken on line 2 2 ot Figure 1,

Figure 3 is a transverse vertical section, on line 3-3 of Figure 1.

In the drawings, the numeral 1 designates a pan-like body formed of sheet steel or other desirable sheet material. This pan-like body comprises a substantially flat bottom portion 2 and side portions 3. The side portions 3 are termed at an acute angle to the bottom portion for a purpose to be described later.

It has been found that when the angle between the side portions 3 and the bottom 2 is approximately 450 the spreading action on the concrete is very eiiicient. The bottom portion 2 is reinforced by means of metal strips 4 ruiming longitudinally of the bottom 2 and extending to the corners ot the bottom adjacent the angles made by the sides 3. The tamper is adapted to be vibrated by any desired means, such for example as by a pneumatic tool. Link 5 having a square boss 6 adjacent the top thereof and being bifurcated at its bottom portion, connects the pneumatic tool (not shown) to the tamper. As shown in Figures 2 and 3, there is a swivel connect-ionbetween link 5 and the bottom portion of the tamper comprising an ear 8, the base of which is riveted or otherwise connected to the bottom portion ot the tamper, bolt 9, nut 10, and Cotter pin 11. By this means a swivel connection is provided between the lever 5 attached to the pneumatic tool, it such be employed, and the tamper which allows the tamper to adjust itself to the depressions or elevations which may be formed in the concrete as freshly laid. The swivel connection also provides for a slight lost motion adapted to allow the tamper to oscillate in a direction transverse to the normal direction of oscillation allowed by the swivel connection.

1927. Serial N0. 199,067.

Attached to the bottom 2 of the tamper are a pluralitv of lugs 11 which may be either solid or tubular. These lugs may be screwed into `holes in the bottom portion 2 of the tamper or may be riveted in place as desired.

In Figures l, 2 and 3 t-hese lugs 11 are shown tubular. It is preferred to dform the lugs tubular thus providing passages 12 which allow air and moisture to rise dto the surface of the concrete when the tamper is operated.

In the operation of my invention the tamper vibrated by any desired means and the lugs projectingr below the bottom of the tamper force stones or other aggregate designated 13 below the surface 140i the concrete which is being laid. The openings 12 in lugs 11 provide for releasing the air which may have collected in bubbles and also the water and allow it to flow to the top of the surface as above indicated. When the tamper is brought down in contact with the wet concrete the sides 3 of the pan-like body because of their angle with the bottom portion exert a leveling and spreading action on the concrete.

From the above it will be apparent that I have provided a simple, durable and efficient tamper which will force the gravel or other concrete aggregate below the surface and leave a smooth surface and in addition because of the panlikc shape of the tamper will exert a spreading action on the material which has just been laid.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

I claim:

1.. A Jramping device comprising a panlike body portion, means for reciprocating` said body portion, and tubular lugs attached to the bottom of said body portion and extending below said bottom portion the bores of said lugs roviding communication with the interior o said body.

2. A tamping device comprising a pan-like body portion, a link for reciprocating said body portion, including a substantially flat bottom and sides surrounding said bottom and formed at an acute angle to and extend ing above said bottom, swivel connections between said link and said body portion, and

tubular lugs attached to the bottom of Said Said link and said body portion, and tubular body portion and extending below Said body lligsattached to the bottoni of said body porportion, the bores of said lugs providing cointion and extending below seid body portion, 10 munication with the interior of said body. the bores of said lugs providing' oonnnuniol 5 3. A ramping device comprising a pan-like tion with the interior of said body.

body portion, a link for reciprocating Said In testimony whereof I alix my signature. body port-ion, swivel connections between JOHN F. MAoDOUG-ALD. 

